/*
* jquery-counter plugin
*
* Copyright (c) 2009 Martin Conte Mac Donell <Reflejo@gmail.com>
* Dual licensed under the MIT and GPL licenses.
* http://docs.jquery.com/License
*/
jQuery.fn.countdown = function (userOptions) {
    // Default options
    var options = {
        stepTime: 60,
        // startTime and format MUST follow the same format.
        // also you cannot specify a format unordered (e.g. hh:ss:mm is wrong)
        format: "dd:hh:mm:ss",
        startTime: "01:12:32:55",
        digitImages: 6,
        digitWidth: 53,
        digitHeight: 77,
        timerEnd: function () { },
        image: "../img/digits.png"
    };
    var digits = [], interval;

    // Draw digits in given container
    var createDigits = function (where) {
        var c = 0;
        // Iterate each startTime digit, if it is not a digit
        // we'll asume that it's a separator
        for (var i = 0; i < options.startTime.length; i++) {
            if (parseInt(options.startTime[i]) >= 0) {
                elem = $('<div id="cnt_' + i + '" class="cntDigit" />').css({
                    height: options.digitHeight * options.digitImages * 10,
                    float: 'left', background: 'url(\'' + options.image + '\')',
                    width: options.digitWidth
                });
                digits.push(elem);
                margin(c, -((parseInt(options.startTime[i]) * options.digitHeight *
                              options.digitImages)));
                digits[c].__max = 9;
                // Add max digits, for example, first digit of minutes (mm) has 
                // a max of 5. Conditional max is used when the left digit has reach
                // the max. For example second "hours" digit has a conditional max of 4 
                switch (options.format[i]) {
                    case 'h':
                        digits[c].__max = (c % 2 == 0) ? 2 : 9;
                        if (c % 2 == 0)
                            digits[c].__condmax = 4;
                        break;
                    case 'd':
                        digits[c].__max = 9;
                        break;
                    case 'm':
                    case 's':
                        digits[c].__max = (c % 2 == 0) ? 5 : 9;
                }
                ++c;
            }
            else
                elem = $('<div class="cntSeparator"/>').css({ float: 'left' })
                .text(options.startTime[i]);

            where.append(elem)
        }
    };

    // Set or get element margin
    var margin = function (elem, val) {
        if (val !== undefined)
            return digits[elem].css({ 'marginTop': val + 'px' });

        return parseInt(digits[elem].css('marginTop').replace('px', ''));
    };

    // Makes the movement. This is done by "digitImages" steps.
    var moveStep = function (elem) {
        digits[elem]._digitInitial = -(digits[elem].__max * options.digitHeight * options.digitImages);
        return function _move() {
            mtop = margin(elem) + options.digitHeight;
            if (mtop == options.digitHeight) {
                margin(elem, digits[elem]._digitInitial);
                if (elem > 0) moveStep(elem - 1)();
                else {
                    clearInterval(interval);
                    for (var i = 0; i < digits.length; i++) margin(i, 0);
                    options.timerEnd();
                    return;
                }
                if ((elem > 0) && (digits[elem].__condmax !== undefined) &&
            (digits[elem - 1]._digitInitial == margin(elem - 1)))
                    margin(elem, -(digits[elem].__condmax * options.digitHeight * options.digitImages));
                return;
            }

            margin(elem, mtop);
            if (margin(elem) / options.digitHeight % options.digitImages != 0)
                setTimeout(_move, options.stepTime);

            if (mtop == 0) digits[elem].__ismax = true;
        }
    };

    $.extend(options, userOptions);
    this.css({ height: options.digitHeight, overflow: 'hidden' });
    createDigits(this);
    interval = setInterval(moveStep(digits.length - 1), 1000);

    $(this).bind('terminate', function (event) {
        clearInterval(interval);
    })
};